LM2595SX-3.3 Equivalent & Substitute Parts

Part Overview

The LM2595SX-3.3 is a buck switching regulator IC from Texas Instruments, part of the SIMPLE SWITCHER® series. It delivers a fixed 3.3V output at 1A from input voltages ranging from 4.5V to 40V, operating across the industrial temperature range of -40°C to 125°C. The device is housed in a TO-263-6 (D2PAK) surface mount package.

This part is classified as obsolete. Locating equivalent or substitute components is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for new designs or production runs.

Substiute Parts

LM2595SX-3.3

Texas InstrumentsIn Stock: 3290LM2595SX-3.3 Datasheet

Current PartRFQ

LM2595SX-3.3/NOPB

National SemiconductorIn Stock: 2227LM2595SX-3.3/NOPB Datasheet

DirectRFQ

LM2576D2TR4-3.3G

onsemiIn Stock: 2742LM2576D2TR4-3.3G Datasheet

MFR RecommendedRFQ

MIC4576-3.3WU

Microchip TechnologyIn Stock: 4001MIC4576-3.3WU Datasheet

MFR RecommendedRFQ

MIC4576-3.3WU-TR

Microchip TechnologyIn Stock: 3498MIC4576-3.3WU-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM2595SX-3.3 is determined by the following critical parameters:

• Output Voltage: Must be fixed at 3.3V
• Package Type: Must be TO-263-6 (D2PAK, 5 Leads + Tab) for mechanical and electrical compatibility
• Topology: Must be buck (step-down) configuration
• Output Configuration: Must support positive output
• Mounting Type: Must be surface mount
• Operating Temperature Range: Must encompass -40°C to 125°C or be suitable for the intended application

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical or near-identical electrical specifications, including output current rating of 1A and switching frequency of 150kHz.

Functional Equivalents: Parts with enhanced specifications (higher output current or improved compliance status) that maintain full backward compatibility while offering additional design margin or regulatory advantages.

Parameter Comparison

Engineering Selection Recommendations

LM2595SX-3.3/NOPB (National Semiconductor): This part provides the closest electrical match to the original LM2595SX-3.3, with identical output current (1A), input voltage range (4.5V to 40V), switching frequency (150kHz), and operating temperature range (-40°C to 125°C). The part is currently in active production status, ensuring long-term availability. This is the preferred direct replacement for existing designs.

LM2576D2TR4-3.3G (onsemi): This part offers enhanced current capability (3A versus 1A) while maintaining the same output voltage and package format. It is ROHS3 compliant and carries an MSL rating of 1 (Unlimited), indicating superior moisture resistance. The minimum input voltage is 7V (versus 4.5V), and switching frequency is 52kHz. This part is suitable for designs requiring higher output current or improved regulatory compliance. Verify that the 7V minimum input voltage and 52kHz switching frequency are compatible with your application.

MIC4576-3.3WU and MIC4576-3.3WU-TR (Microchip Technology): Both variants provide 3A output current in the same TO-263-6 package. They are ROHS3 compliant with MSL rating of 3. The input voltage range is 4V to 36V, and switching frequency is 200kHz. Operating temperature is -40°C to 85°C (TA), which is 40°C lower than the original part's maximum junction temperature. These parts are suitable for applications where the reduced upper temperature limit is acceptable and higher output current is beneficial.

Frequently Asked Questions (FAQ)

Q: Can I use LM2576D2TR4-3.3G as a direct replacement for LM2595SX-3.3?

A: The LM2576D2TR4-3.3G is functionally compatible but not a direct pin-for-pin equivalent. It offers higher output current (3A versus 1A) and improved compliance (ROHS3). However, the minimum input voltage is 7V instead of 4.5V, and switching frequency is 52kHz instead of 150kHz. Verify these differences against your circuit requirements before substitution.

Q: What is the difference between MIC4576-3.3WU and MIC4576-3.3WU-TR?

A: Both parts are electrically identical. The difference is in packaging: MIC4576-3.3WU is supplied in Tube packaging, while MIC4576-3.3WU-TR is supplied in Cut Tape (CT) & Digi-Reel® format. Select based on your procurement and assembly requirements.

Q: Why does LM2595SX-3.3/NOPB show as the preferred substitute?

A: LM2595SX-3.3/NOPB maintains identical electrical specifications to the original part (1A output, 150kHz switching frequency, 4.5V to 40V input range, -40°C to 125°C operating temperature) while being in active production. This minimizes design changes and validation effort.

Q: Are all substitute parts in the same TO-263-6 package?

A: Yes. All substitute parts listed use the TO-263-6 (D2PAK, 5 Leads + Tab) package, ensuring mechanical compatibility and identical PCB footprint.

Q: What does MSL rating mean, and why does it matter?

A: MSL (Moisture Sensitivity Level) indicates how long a component can be exposed to moisture before soldering. MSL 1 (Unlimited) means no time restriction. MSL 3 (168 Hours) means the component must be soldered within 168 hours of opening the package. Higher MSL ratings require more careful handling and storage.

Q: Can I use a substitute part with a higher output current rating?

A: Yes. Parts with higher current ratings (3A versus 1A) are backward compatible and provide additional design margin. However, verify that input voltage range, switching frequency, and operating temperature limits are suitable for your application.

Q: What is the significance of RoHS compliance?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. If your application or market requires RoHS compliance, select LM2576D2TR4-3.3G, MIC4576-3.3WU, or MIC4576-3.3WU-TR.